Coupling for well casings



Nov. 24 1925 1,562,675

v R. c. BAKER COUPLING FOR WELL cAsINGs Filed March- '7, 1923 3 Sheets-Sheet 1 INVENTOR. REUBEN c. BAKER.

ATTORNEYSf Nov. 24,1925. 1,562,675

R. C. BAKER COUPLING FOR WELL CASINGS Filed March 7, 1923 3 Sheets-Sheet 2 INVENTOR. REUBEN c. BAKER.

AT TOBNEYS.

Nov. 24, 1925. 1,562,675

R. c BAKER COUPLING FOR WELL CASINGS Filed March '7, 1923 3 Sheets-Sheet 5 INVENTOR.

REUBEN c. BAKER.

AT IORIIEYS.

- citizen of the United Patentedllov. 2.4, 1525.

UNITED STATES REUB N-c. BAKER, or coALInoA, 'cAmromirA, ASSIGNOR 'ro BAKER 'conrANY, A CORPORATION or CALIFORNIA.

PATENT CFFICE.

CASING snon cournme non wnnr. cAsmGs.

To all whom it may concern: a

Be it known that I, 'RgunnN. C. BAKER, a

Coalinga, county of Fresno, and State of California, have invented new and useful Improvements; in Couplings for Well Casings, of which the following is'a specifica-' tion. r

This invention relates to deep well equipment and particularly pertains to coupling devices for repair- Lug broken well casings in a well.v Prior to the presentinvention, the method employed to repair a casing in a well;

tat-es, residirfg at of the die coupling disclosed ,in the previous figures.

Fig. 4 is a side elevation embodying the invention;

Fig. 5 is a bottom view of the same. Fig. 6 is a view disclosing the application ofthe coupling tap. i

Fig. 7 is a vertical section through a combination die and tap coupling embodying the of a coupling tap invention.

Fig. 8 is' a view in section and elevation disclosing the application of the same.

Referring to the accompanying drawings, particularly to Figs. 1 to 3 inclusive, 9 indiwhen the threads stripped at the union of cates a ylindrical die couplingcomprising a body p0 tion 10 formed at its lower end with parallel die threads 11'. Above these threads I the casing sections or when the casing was broken, was to remove the .upper portion of the casing from the well and then lower suitable taps or dies into the well to recut the threads on the stripped part? or to cut threads on the broken end of the well casing. The end of the removed portion of the casing was similarly repaired" and when the dies or taps were removed from the well. it'was obtain a perfectly water tight joint between the repaire parts. Therefore, it is the principal object of thevprsent invention to provide a couphng with a wide range of adaptability, and which may be lowered into a well to thread damaged parts of a well casing, and to connect the same infi manner insuring a perfectly tight'joint of maximum strength. 4 r

The invention contemplates the use of a member having cutting threads and followup thread'sto thread damaged parts of a casing in a well and act as a coupling to connect the damaged portions of the casing with a strong and water-tight joint.

The invention is exemplified in the .following description and illustrated by way of examlple in the accompanying drawings, in whic Fig. 1 is a perspective view of a die coupling'embodymg my invention.

Fig. 2 is a vertical section through the samedisclosing its construction. t Fig. 3 is a View disclosing the application maximum strength;

the coupling is tapped with parallel or. straight threads 12 which terminate in tapered threads 14. The upper end of the coupling is also interiorly threaded, prefer: .ably with standard tapered threads.

I'n'Fig. 3 15 indicates a section casing in a well, the upper end of which .has been broken ofi or the threads thereon stripped where it enters a sleeve collar. To repair this damage in a well, the'upper portion of the casing is removed and the die coupling 10 is threaded-on its lowerend as indicated. It is thenldwered into the well until the lower end of-the die casingfengages the stripped or broken end of the lower portion of the casing 15. It is then revolved to cause the diethreads 11 to cut threads thereon. This operation is continued until die threads feed the coupling onto'the casing an amount suificient to cause, the newly formedv the straight threads 12 will serve as follow-' I up threads for the die When the die coupling is firmly' onthe lower section of the casing it serves' as a very eflicient joint between the two damaged portionsQof the casing and may be applied at any depth in thewell. p The couplingtap illustrated in Figs. 4 to 6 inclusive-is similar in ever irespect to the coupling die with the except1on that it slower end is formed vwithmale threads to serve to insure a joint of.

as a tap instead of a die.. This device is fitted with straight tap threads 16, parallel or straight follow-up threads 17 and tapered threads 18. Also the upper end of the member is interiorly threaded for the reception of the threaded end of a well casing. This deviceis mainly employed to re-cut threads in a stripped or broken casing sleeve coltions of the casing and sleeve collar.

lar and in operation is exactly the same as that of the die coupling previously described.

The combination die and tap coupling illustrated in Figs. 7 and 8 comprises a cylindrical body formed at one end with a straight die threads 21, follow-up parallel or straight threads 22 and tapered threads 23. The other end of this member is formed with straight tap threads 24, straight follow- 'up threads 25 and tapered threads 26.

This form of the invention is principally used to re-cut threads on the adjoining por- In operation the upper portion of the casing is removed and its lower end re-threaded by applying the device 20 thereto. It is then lowered intovthe well until the lower end of the member 20 engages the lower portion of the well casing and re-threads the same.

The formation of the threads on both the male and female ends of the device are such that a perfectly water-tight fit between the connected parts will be effected, and the device 20 will serve as a strong durable coupling.'

From the foregoing it is obvious that a very desirable tool has been provided which may be efficiently employed to rigidly connect damaged ends of casing sections in a Having thus described my invention, what I claim and desire to secure by'Letters Patent is r 1. A coupling for connecting contiguous cutting threads to form a firm connectionbe tween the pipe and the coupling, and tapered full threads formed as a continuation of the straight full threads to form a tight fit between the coupling and the pipe.

2. A. device for connecting contiguous ends of a pipe and a coupling, said device comprising a body portion being threaded at one end for the reception of the end of the pipe, tapping threads formed on the other end of the body portion to engage the end of the coupling to thread the same, and full straight and tapered threads formed as a continuation of the tapping threads to follow the same and form a tight fit be tween the device and the coupling.

3. A device for connecting contiguous ends of a pipe and a coupling comprising a body portion having die threads at one end to engage the pipe end and thread thereon and tap threads at the other end to tap the coupling and threadedly connect therewith, straight full threads following the dle threads and the tap threads whereby a firm connection between the parts is made, and tapered threads formed as continuations of the straight full threads for forming a tight fit between the parts.

4. A device for connecting contiguous ends of a pipe comprising a body portion having cutting threads at opposite ends thereof, full straight threads following the cutting threads, and full tapered threads formed as a continuation of the cutting threads to form a tight fit between the parts.

. REUBEN C. BAKER. 

